Two-cycle gas-engine.



PLICATION FILED DE()y 22, 1908.

Patented Feb. 8, 1910.

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Aof `the caused by the piston becoming overheated,

l TED STATES PATENT C.

JOHN M. JOHNSON, ALFRED c. JoHNsoN, AND AUGUST JOHNSON, or sUNNYvALE,

CALIFORNIA TWO-CYCLE GASENGINE peeication of Letters Patent.

Patented Feb. -8, 1910..

` Application lei December 22, 190.8. Serial No. 468,730.

Engines, of which the following is a specification.

Our invention relates to improvements in gas engines, particularly of that class known as two-cycle engines.

It consists in a means by which the piston engine lmay be partially cooled, so .as` to.prevent pre-ignition which is otherwise to prevent the burning of lubricating oil, and to provide a more perfect vaporization, so that a lower grade of fuel maybe employed.

. It' also comprises details of construction u which will be ,morel fully explained by'refer ence to the accompanying which p Figure 1 is a side elevation partially\ in section. Fig. 2 is a cross-section on line X-'X, Fig. l.

The cylinder A is provided with the usual cooling appliances, which may either be water chambers, or air cooling devices, land is closed at both ends. Thepiston 2 has a drawings, in

piston-rod 3 passing through a .stung-box at 4, a 'cross-head 5 travehng in guides 6',

and a connecting rod 7 extending to the vcrank on the crank shaft. The charge of combustible mixture is admitted to the eli-- -gine througha valve, at 8, from the carbufreter or source of supply.V not here shown.

From this Valve it passes mwardly through a passage 9, and is thence admittedinto a pipe 10 which extends longitudinally from 'y the inlet passage within the outer portion `of the cylinder and toward the piston 2.

This -outer portion of the cylinder, by reason Vof its closed end and stufling-box, forms a compression chamber of the engine, and

from thischamber a port 12 opens into a conducting passage 13 exterior to 'the inner wall of the cylinder. From this passage a port 14 opens through the inner wall of the cylinder. This port is normally closed -by the periphery of the .piston until the latter j approaches the limit of its power stroke, at

which instant this port 14 is opened, and gas lwhich has been compressed in the outer `means, indicated at 1 7.`

-The charge of cool gas and air forming" Thus, any products of combustion are allowed to escape through the exhaust port under whatever pressure remains within the cylinder at the termination of the stroke, and an instant later the compressed explosive charge enters the cylinder, and by means of the deflector 16 is causedto pass to the inner head of the cylinder; and in the process 4of filling the cylinder with a combustible charge, it eliminates and forces out the re.

mainder ofthe products of combustion before the exhaust passage is closed. The compression of this gas takes place on the return stroke of the piston, and at the de.- sired point in the cycle thecharge is ignited by the usual spark plug, or equivalent the explosive mixture which enters through the passage 1-0vis delivered against the pis ton 2, and itacts first to partially cool .and reduce the temperature of the pistou; and this allows the engine tobe run at a higher speed, without so increasing its internal temperature as to injuriously burn the lubri eating oil. lThis saves the Oil, as well as prevents carbonizing the interior of the cylinder. It also serves to `prevent the temperature rising to such a point as to cause a pre-ignition of the gas before it is in position to do its work. vA further advantage is that the heat of the piston .raises the temperature of the charge before it enters the working, end of the cylinder, and it enables the engine to be run with a `much cheaper grade of fuel. In case there is any lackof perfect vaporization of the charge, this 1ncrease in temperature will substantially com- ,plete the vaporization, so Athat when th 'charge enters the working end of the cylinder it vwill be inthe'` condition of highest eiiciency for the work.

Having thus described our invention,

what we claim and desire to secure by Letters Patent .is-

.1. In an engine of the character described, i

the combination of a cylinder.` closed at both ends, a iston adapted to reclprocate m said cylinder,a piston rod extending through the outerends of the cylinder, a crank shaft to which the outer end of said rod is connected, am inlet valve atone end of the cylinder, said cylinder h'aVln a assage at one end connecting withl sai va veand adapted to admit an'explosive mixture to the-outer portionf the cylinder, a pipe extending sull-g stantially parallel with the axis of the cyl-l inder having one end connecting with said inlet passage and the otherend leading t ward the piston, said cylinderl havingV its .compression chamber formedv between the the compression chamber to the'working end of the cylinder, said port being controlled by theoperation of sa1d piston. Y

2. In .an engine of the character described,

- the combination of a cylinder closed at both endsa piston adapted to reciprocate in said cylinder, a piston rod extending through the :outer ends of the cylinder, a crank shaft to which the'outer end of said rod is connected, an 'inlet Valve at one end of the cylinder, said cylinder having a passage at one`- end connectingwith said valve and adapted to assage and into which chamber admit an explosivepmixture totheou'ter portion of the cylindena pipe extending stantially parallel with the axis of the cyl' inder having one end connecting with said' inlet passage land the other end leading toward the piston, said cylinder having its compression hamber. formed between the iston and the end o the cylinder containin said passage and into which chamber sa'id pipe leads, whereby .the charge of cool gas and air forming the explosive mixture is delivered .against the piston and acts toy partially cool and reduce the temperature thereof, va supplementary passage and ports through which thechar'ge is admittedfrom the compression chamber to the working end of the cylinder, said port being exposed at -,the termination of the outwardI stroke of -the piston, a deiector' carried by thepiston,`

an exhaust' port controlled by said-piston,

and "meansfor igniting the charge com-.- pressed in the working chamberof the cyle inder. l

In testimony whereofl we have hereu'ntoiI set our hands in .presence of two Subscribir'1g1 witnesses. A v v ,Y v

JOHN M. JOHNSON. Y

ALFRED OJOHNSON. AUGUST JOHNSON.

llV-itnesses:

. A W. E. OnossMAN4 L. H. VIsHAnr. 

